Actions Performed by the Sun Cluster Geographic Edition Software During
a Takeover

When you run the geopg takeover command, the software
confirms that databases in the Oracle Data Guard Broker configuration on the standby
cluster, that is, the future primary, are enabled (as you cannot perform a
takeover to a disabled database). The software also confirms that the Oracle Data Guard command-line
interface show configuration command either shows a SUCCESS state or is busy performing a health check (ORA-16610).
If the show configuration command returns any other Oracle
error code, the takeover fails.

If the original primary cluster, cluster-paris,
can be reached, the software takes the application resource groups offline
and places them in an Unmanaged state.

On the original standby cluster, cluster-newyork,
the software performs the following operations:

Runs the script that is specified by the RoleChange_ActionCmd property

If the protection group was active on the original standby
cluster before the takeover, brings all Oracle shadow RAC server proxy resource groups and application
resource groups online

If the command completes successfully, the standby cluster, cluster-newyork,
becomes the new primary cluster for the protection group. Databases that are
associated with the Oracle Data Guard Broker configurations of the protection group
have their role reversed according to the role of the protection group on
the local cluster. The Oracle shadow RAC server proxy resource group and any other application resource
group are online on the new primary cluster. If the original primary cluster
can be reached, it becomes the new standby cluster of the protection group.
Replication of all databases that are associated with the Oracle Data Guard Broker configurations
of the protection group are stopped.

Caution –

After a successful takeover, data replication is stopped. If
you want to continue to suspend replication, specify the -n option
when you use the geopg start command. This option prevents
the start of data replication from the new primary cluster to the new standby
cluster.

If a previous operation fails, this command returns an error. Use the geoadm status command to view the status of each component. For
example, the Configuration status of the protection group
might be set to an Error state, depending on the cause
of the failure. The protection group might be activated or deactivated.